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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907c68bcca7b69a8557fa63afb3cd5bc114262a0b8d50fc4577480b90e4a5678' 
  AND token = 'b/xr0r2v8xvlnfrQKiQrTea+w5kmsyPR5Ubl/cp5u1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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