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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb361bb62f2a4ec464c085fa5778a732c5ebf9fd1ecbb359c1e0da54be7576bb' 
  AND token = '1kY5boaSV3bxnHhiWxj132t9pvV14rat6F2UjhbYxXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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