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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ccdc3024356191b442b81b98ff0975872abe0a9036493568ad708e4fae3ab1' 
  AND token = '1JNI8qcJvDRWc2wSGgmGrqEYh8AGITa7M2hm7V9V9Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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