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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba07e75b35ac3ea3b6008c4a5436b6c8518667cc04d0925f7db6525759f5db78' 
  AND token = 'd1GYp36DFAIv5LtvYAuyNGfZBHKrms5l9Dg8xKyvZVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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