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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7996e082fe15b88f4a21419afa41e13c9198ce5bdb30ecad251519ace8fa88c8' 
  AND token = '76d1nPBcXVJ24hP8eosBVUMpHT7sGum1/KfhxGH0poc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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