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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a47d2c7df327cc7957c001ef5c4238d5443495235673b43b5c5bd3a6dc0db3' 
  AND token = '3W9zJIpFFaqMOpI/LMDkB5JiSnZyYSDNo3EQfDPnu38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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