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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e88873f8d36c2ff634ca0c7aa2816a1e06567639446b1e2adba7d8a4cee627' 
  AND token = '/HJgf0PvR3/7UtkRC6DkEuCA1sgIskBkix866r0CUxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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