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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a904fe2999aba9d3abfb60ce2dc110985ea17133e3f66dc28c34a515c6d6d1c5' 
  AND token = 'uqSTX0+5lO8csPAbJAQCKiZuQU//Xyad0SyruArkU5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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