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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e82df5f8ebefd0ce354958e14ac6c0103aa037833c5a938185e0cdcdf2b0370' 
  AND token = 'ICjfzr35lugeERIFe0mkxYyZ0uDTTaqJ3/hv7uT3rdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}