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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa061c92aa4a5925a59d779a1a08c8771c91d0b550a6bd0af33dc55aaa51658' 
  AND token = 'mtm0K5uv4MoCPh7b95AYPWxqy5fksUEsBwt+9K3rFkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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