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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1f207525f35c89f188c5766aed0b00f377737c0cf610220d492a64764128ca' 
  AND token = 'dhBOWFLQsNGHgCznIL0yTHu8r1By2LG7FJ/0HD2VEZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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