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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56f4d3cc18e681d0c9dcf3f3470cfcf1898be04b86cc9fb108a426c7a91321c' 
  AND token = '565u1GfvpZhIgn/kgp/77rywr5P+e6YpKIr7lkRmtd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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