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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f88be9c56ea434a908e05c5936661b3da6ca15b2edf705fe37fa10d649a776' 
  AND token = 'dYGEmu3vvWFGB1SQpDw4iq72fScA32VPRw6Ai+t9nS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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