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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32932d9cd67483c8769be3f1f0acdc3af96fcada7018112d3f4027579dd4493e' 
  AND token = 'Y/WQYzmvv74MCM1dc05KEH2KPcg7ErplxxxF+zpKvXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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