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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacb2c3975f2993e1dea2a6db70f71352e47f4af508d349fab43c7c7f2ec114d' 
  AND token = 'ukJVbML3jlyTQCoaxqRKXMPYkiB4knlyikGK9cjIL7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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