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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347fe4bb37d70bc757b1ef47ac29fb00be304daeba3114a08038c77daeba81da' 
  AND token = '4meKdcJ9RkJ6j9A3RYLBSVDul4JJwoiCN4acMNINM50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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