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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c3c4afbc274ceb299fa5d487556acff436d499aea276830927da8d2c24d273' 
  AND token = 'H84QRoSlVk9aZ3GgvQbljZ0fvTozoSyTO2D/tYdcAQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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