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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b1b0b0145b21d88bb7916274a6331ac0cab51f6f091537b411f312d9a0456b' 
  AND token = 'jtnQso5aDepFhhMD0sZOMO3wfIEMviVFJkDlTJkFSjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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