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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a26a365d4de3037642585652ae795eadeebd9e38b10874d9255b2efb168118' 
  AND token = 'AhfRGOCa+jM4dt3Kx2AUG1kSx+jjO1TEdcv/5lGI/+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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