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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004fecc32f4511329adc3b05c3fa1e294d77da85511fb23fee66bbb123b1902d' 
  AND token = 'Tv4MaVGAmv0fa6/+w/vnqO90AiQkL/e65tLQKZdgEOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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