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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b155f178aa811f30fd4e8b5b614ac9109a7de49f7744b213e5db70a1f4e08b36' 
  AND token = '6IQ5GuQOY28SSNThjWzB6Hisz3z5Lgo5B1RLCZBxXq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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