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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f7dda975c9192080ac420d9a1e07bc40ba6c3db4279ba1272607b6571a9d78' 
  AND token = 'SY2phvZwTu01ouQUhMFF/tX78z3iDpYiFovM8ExdRhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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