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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1126168114fca2bfb7b9ad5fccd45074ea478a107c3e9d5d1ba20bb90ee8f3d5' 
  AND token = '2DH2KhKg91cvKwPrfP9WFQAyJX7HS73kE4GurCHvoog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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