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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039284088bf3500a3b7312f19a5f8d5251ca74f2f716e20c48f919709c304ecd' 
  AND token = 'VMJV/ckiE70Y10NxUJ5sTbp6PXhyOGoUFKCtBZ7F1R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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