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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898d399e002b0ad1796b00631aa5255df75d4a4c8e07b0d5f1139171aff7906e' 
  AND token = 'v+xawiMPAV/7qP7LugFijnkWXzw0nvgQBymSo3E7IHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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