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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576ff97e5f7a0597950f7f3926f22ca343bfa5bb6168511d4384569839683dfb' 
  AND token = 'z3xdQYLDHI38GTl2hRNF0V9WyfGpTlCMwgbP+HOab5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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