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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44ae99a11168d088970edbbd113efd31b3fb1cefc270058ba0df2eed334f196' 
  AND token = '+TKSBBOAPzcP0FqU4vOEYNNnEPq7ZyVKJl1Tts6J6+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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