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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ddac5072433337b3e9ea601a673552b34f003b52375d4d9c0ea0ed8568db0be' 
  AND token = 'BQB5a/5mY9F9B9/O0CZWJxMXgSHBc2Sgi18PaTNuob0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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