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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f244321c3c49752acfe2b9dbf3d60eec27da62db90fd45353a922b54dfea71' 
  AND token = 'Zcp79BhwCS3VFv7RhoCLcKl05+Rctoa26yQFPqDvHLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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