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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8a3bc3125a89427c1836403f97fca4c698119a13a93567d332ebf30b440f0d' 
  AND token = '3uhS/auWsIff1oDDMiMcAvb90gkaQi8uwCQ4mpqw2nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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