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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771ee1920ca34069901c8b6fd6634ccd8df8860ac14ad2ce3c00f6addd1532cc' 
  AND token = 'kFl/XpCwBf3M+jhqogdLyIlfETuqbwW6X6qlqODXFrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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