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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc8ee27e552f3e2de6e5de2ac0110b8b2d848fa05041838dddc43ec8097e033' 
  AND token = 'VW4xb5W9Qk4hJaicMooMPBSPZ3ui9nt5uGrLrQpsYgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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