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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59e4b3c46d5996cc12f4d35c170eeb86982c3013db6ac8a0b9e1d75830a7c7e' 
  AND token = 'LLHBi9UMMUdb7IQSk5KqBE5M6SOLmkV7sF/fL9CQ7B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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