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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7095ab5d84b4476441cccb953e4335cb43fadaf5b77c2f11c6e603b9722ea1' 
  AND token = 'c77Hi1i9GXWJNYfYlHBS4yYmacRZCPH4ijz6qqLDfbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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