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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bcca52f00c0b334501ce7605fb7689d2b100f9186894ee6d84b282e837cbcf1' 
  AND token = 'n4Vm8XnI47PsOJokMqMVR8BXG5ThIHpEZL9n8D/kaSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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