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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70724008339d0b833e3746d78aafe4d043ba668fcbb95502cd7ce9497b8677e6' 
  AND token = 'lPgMbxjc80DGQRHEi5r5ikZ/Dy7cyBzpJyTNWJzZqiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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