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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b6025e1d15e720cf2d6b459806db3862e6a6edae0246c0b78d271a8c029980' 
  AND token = 'Vo4ffcf/gXx/HVE7nUNyv860gKqd6FcJMp+lypxdT7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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