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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2362054c6b15033eb57aeb13288834a9d61d281f1525a1c18b552519607866' 
  AND token = 'h3WAmjuonvJ2dc5oG2qh8POSHpKsEJuvxVI3X2kuGrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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