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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ca12a90eca0f90120a585d9f2f96a8e6848237490c8283c9d3add8bc2e6046' 
  AND token = 'Re0DLvjIE2rZB3/qN0+gajlLmxx5wBGpNGQRrp0/ElY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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