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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7847cab97dd619142bc911dbb83fb9a6c53b2fcc43b1bfccef246caf13f06aaf' 
  AND token = 'P8vPoqHhHayJ0+CBBSXIgGQaQtyL1irmw+w48qBtP9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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