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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c6f49b3b112d3e2236c879f99e86a4b08a927d54591fb2e2ab1254c3e93edb' 
  AND token = 'A2hJnG8lbo5w4kU4G/ryp0xAufiitCOhZpLpplRYd98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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