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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f9fef44592bf8a595a37431ec1c31d65a5b0eb11867d8f502493c1cc66a83b' 
  AND token = '7UyHCPYCTC+mEkyAgH4mzD3B5HtntrfRqXySDutDNpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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