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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e364b0b531095d8c0c7a1fd06ad4cc11a7e35de54be5f14bc2adbc830e5f0ba9' 
  AND token = 'tHW1VZEKgRhzgiUCaaG3NMCE9D60io/OograOjOzLks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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