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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbe31447b327a9def057dce4a67b859ce2b5f9d2651880e20860f41c1780853' 
  AND token = '9L3dB+w/qA2yzBo3RHTKIS7Q/1xULBDjUiFudQSWFbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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