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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89773bc35f501e3e2896401f62a7f26163b01b49fdc820137c7b3ee05268001' 
  AND token = 'C1oWWMg/yA6Q5HA35cg6iC7g2ekm3Nq2AUCYmLAxWNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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