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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e082b7ae376a41a7eefdeb74d483cb57fb8d87c84488867360d70c4aa7a0358' 
  AND token = 'q1Bba89CxyEoPkdaLRCPkwaVF5g77VEbYBML0MwVmxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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