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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae37df86e97fe3803277c28a31dff97e88f850850fc5a3591fbffadd5fa72a3a' 
  AND token = 'qceHsvr7xaG2Jt3Sl8NQh/Fw3myTYy10w6NC53uD5mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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