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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f88d0ecdc609c3fac2fecaadf7faba1042ddf15590b54f2b9dcd0bdce7dc683' 
  AND token = '6pAs/MNUBS1yv559ydJWYl0vWmvIyJxS9YU6OluhI2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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