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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e252935d9516de79628adc20c2b993e8d80e3e4058df5534b99d7ed7cbf82e10' 
  AND token = 'KDSSO19nbYA9gN8kZrGQ2RAijjA68Leva1EPaM6VNIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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