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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb50add30062f823e6d02daa09033d68594d036b931bd11bd1438ca51ccd065' 
  AND token = 'i6wMjZCTXYyrGtGdo1ol/DmB5Bytl1JWvb/oeynj990=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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