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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54327db9b7023ab0e9025012e7ffae531cb74e7986d79f862aad2214d8bde84' 
  AND token = 'nB3bjh7YmrKEllf7n4JIkoc0Ns1dEJQOHRfoZ3ob1LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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