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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9cbc4f2be2b7bd2ffce29cc6431179384a21efa2cd5855d5b5e99c0ad5987b' 
  AND token = 'VHeUAIQ83HPKjQE3Nvph9DEZkuUkoDBbr+rcNbVT/ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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