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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60ddbd71f4c6caa78e80421c23244567dbb5978e6a965ef6edef2ea93986d42' 
  AND token = '3203ocRvZWgGI9KBolONdZdsf/X+nVYaRAS7oRP8W/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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