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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b1fee07208a64193b84c922b401a6b3088e37a7441d767d4f370b36c5e0beb' 
  AND token = 'lhY6ZhctQKJ3jO/aMNYaGLL8JKBY8Hre86XBvkXwJIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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