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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ceecd5588664fb7414d013cb545344bf882ba17fd55490357995447970084a' 
  AND token = '+DJpVcD6FxOf5f9lu+tXf50yMFpYInHkrmFVWxGf/MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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