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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0960ca95412c290a2d87c7b959d9b4e85d3bcd6e8fb8bd7d8efd53be684f96e9' 
  AND token = 'CNQV+5VtsAylUnB0JD8huYDZCs6Lw6bVzWrA/b/mBx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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