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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f6d63c16550479cbd513fcc1c5067d5b709c00fe24df76034df64975830753' 
  AND token = 'tCDdrMaIJWg7h1PVRvdOpumbplwVVLBQYSktHFPyYNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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