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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7256a764d9c7baea7f60cc74cf7c7154a1bdf8de6e43c9e5e32f65ecb80d8c03' 
  AND token = 'V9pbProZxouRInDPIjMyCj0GuSrmRQlb40pRESs5J5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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