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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cec29cd087e0d0e8231b49b43268df15d39df2af0f46b5d37d483e43b787513' 
  AND token = 'pFrk7i5iwuwjmcK/lQUd1cbh79NFJJFHVlfiVha2GwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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