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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a5c7b6ba0b02cdd97057518ece172d763f0d0a2f6aa36d10b184108da3c6ab' 
  AND token = 'gTa6PL3ruQYIiH1+agHtoWWCOjnb2moF8nRgn326uf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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