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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63f6183db5a7f9593cd59a08cf0c27465d1bdca675188a65f1f2420c608772b' 
  AND token = 'mA7OSA39jMGLM9HqTCuB7VNMw68A3uiFKiM/3NTnpmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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