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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05978ba0081f4ad8b12af6aecedd955d467aa74ac9be260b1f682603f688fbae' 
  AND token = '3E+qIM5E4zZGpYAx/sNF0x4WjagJ5DlA0n1Er10A51I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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