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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e76048436e861931cd125ee93cc5dfff61eaa51420c982d5ad4c45466cfbe1' 
  AND token = 'RB3oB5e+226oac3o8iG+l7mx1z4oLqihMudrJBHtys0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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