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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd9754e57aee3a7556ba04e402e0c2c13f33e9080d4e2df1a1d27f8487beebb' 
  AND token = '/Sory1ecHykSV5ZxarHxL7Elmfbu9//9naqhDqn582g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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