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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5971894113f3067828b83d9d4f05d0ad6ae32ab3134374bc75ff4633f26341a1' 
  AND token = 'M34xLD3r6tdNf78xP9S/sPRHYoksnQ5Cjr+GrWalmbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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